Buffer overflow in Zyxel Atp100
CVE-2023-33009
A buffer overflow vulnerability in the notification function in Zyxel ATP series firmware versions 4.60 through 5.36 Patch 1, USG FLEX series firmware versions 4.60 through 5.36 Patch 1, USG FLEX 50(W) firmware versions 4.60 through 5.36 P…
Vulnerability class: Buffer Overflow
EPSS: 0.281 (97.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Zyxel Atp100
- Zyxel Atp100_firmware — versions 5.36
- Zyxel Atp100w
- Zyxel Atp100w_firmware — versions 5.36
- Zyxel Atp200
- Zyxel Atp200_firmware — versions 5.36
- Zyxel Atp500
- Zyxel Atp500_firmware — versions 5.36
- Zyxel Atp700
- Zyxel Atp700_firmware — versions 5.36
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Public proof-of-concept exploits
References
- security@zyxel.com.tw (Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2023-33009?
- CVE-2023-33009 is a critical-severity vulnerability in Zyxel Atp100, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2023-05-24.
- How severe is CVE-2023-33009?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2023-33009 known to be exploited?
- Yes. CVE-2023-33009 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-06-05), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.